Improvement in let-off motions for looms



B. W. NICHOLS. LET-OFF Mono N FOR LOOMS. v No.177.543. I Patented MaylS, 1876.

N. PETERS FHDTO-LITHOGMHIER. WASHINGTON. DJL' warp-beam and let-off rolls,

BRADFORD W.5NIQHOLS, OF FALL RIVER, MASSACHUSETTS, ASSIGNOR or PATENT *OFmon.

ONEiHALFHI SRIGHT T0 in. o. 'K1LBUa'N,oF SAME PLACE;

IMPROMEMENT! I N LET-OFFSM OTl'ON-S FD R LO-OMS.

Specification formingpart of LettersPatentNo. {77,543,- dated May 16, 1876; application filed October JQ, 1875.

.To all whom it may concern: I r

Be-it =known1that l, BRADFORD W. Nlon- OLS, 0f the cityot' Fall River, in the county of Bristol and State of Massachusetts, have invented certainnew and .useful ImprovementsinLetOif Motions for Looms; and I do hereby declare that th e'follo'win g-specification,

taken in connection with the'drawings furnishedtand forming a part f of the same, is a clear, true, and complete description thereof.

My improvements relate :to that class of let-oft lllOtiOIlSzWhlGll control the delivery of warp from the beam by means of mechanism V To more particularly describe my invention I will refer to the accompanying drawings, in which Figure 1 represents, in rear perspective, a loom embodying my invention. Fig. 2 represents, in perspective, the let-off rolls detached from the loom, with their hangers. Fig. 3 represents, in vertical section, the with warp 'in proper position.

The frame of the loom is not materially unlike that of other common looms. The lay at and cloth-beam at B, with its actuating mpechanism, possess no novelty. The harinesses and reeds are not shown. The warpiheam at G is of usual construction. D denotes the warp-delivery roll; E, a guiding-roll, and F a nipper-roll.

When new looms are constructed with my improvements, the main frame will be provided with bearings for the axes of the delivery and guiding rolls. When applied to looms already built, hangers, as at b, will be attached to the old frame.

As hereshown, the delivery-roll D is proer, or other suitable material.

vided with bearings for its axis, in hangers attached to the frame of the'looin. For securing a good frictional surface on's'aid roll,I prefer that it be clad with" paper, cloth, leath- The guidingroll 'E is also mounted on the same hangers, in open boxes, for-facilitating its adjustment with relation to-the warp and delivery roll. Its surface should be permitted to lie :inclose contact with the surface of the delivery- :roll throughout its length. The nipper-roll the tensilestrain on the warp may force the roll downward upon the warp interposed between it and the delivery-roll. By having the nipper-roll mounted in the links, as shown, all of the tensile strain on the warp operates to force the roll downward upon the warp, whereas if said nipper-roll journals were locatedina verticalslot at each side of the loom, the nipping effect of the roll on the warp would be modified by the tendency of the roll to rise in its bearings, and by the lateral pressure of its journals against the front side of. the slot. The guiding-roll and nipperroll'are placed with relation to each other and to the delivery-roll, in such a manner that the warp will be in frictional contact with as much of the surface of the'delivery-roll as possible. The delivery-roll is revolved by positive mechanism, which, in this instance, consists of a chain of gearing, commencing with the gear d on the main shaft of the loom, (or other suitable driver,) the pinion e, mounted on a stud projecting from the low frame, a worm, f, connected to the pinion e, a shaft, g, mounted at right angles to the pinion-stud, and having at one end a gear for engaging with the worm f, and at the other end a worm, h, for engaging with a gear, '17, (mounted on another stud, which also projects from the frame.) connected to a gear, 70, which, in turn, meshes with the gear 1 on the delivery-roll D. The regular operation of the loom obviously induces a regular delivery of the warp.'

It is to be understood that I do not claim the specific mechanism for thus operating the delivery-roll, and that i am aware that linkgearing applied in a manner well known may be employed in this connection, which would render the use of change-gears practicable whenever it was desirable to vary the speed or delivering capacity of the let-off motion.

The guiding-roll is readily removed from its open boxes and the nipper-roll from its linkbearings, which facilitates the adjustment of rolls and warp. When the rolls and warpbeam are properly adjusted, the warp extends from its beam upward over the guiding-roll, thence downward under the delivery-roll, thence upward, backward, over, and partially around the nipper-roll, and thence forward through the harnesses and reed to the clothbeam.

It will be seen that when the gearing is properly timed the warp will be regularly and evenly withdrawn from its beam, and that it will be always firmly compressed between the nipper-roll and the delivery-roll, and that this compression will be increased in proportion to the intermittent strain incident to the throw of the harnesses and the beat of the lay.

I am aware that it is not new to positively control the delivery of the warp from the beam, and also that a positively-driven deliv- Having thus described my invention, I

claim as new The combination, with a positively-driven delivery-roll and a guiding-roll, of a nipperroll mounted in link-bearings, substantially as described, whereby the warp from the beam may be maintained in close contact with the greater portion of the peripherical surface of the delivery-roll, and firmly nipped between the surfaces of the delivery-roll and nipperroll, as set forth.

BRADFORD W. NICHOLS. Witnesses:

JOHN Snonrr, WILLIAM H. KENYON. 

